1989 Ski-Doo Repair Manual, Page 29Get this manual
Section 01
(SERVICE TOOLS)
Sub-section 02
SERV ICE TOOL PURPOSE APPLICATION
Seal protector sleeve PTO 420 9779 10 MAG 420 2769 00
To avoid seal damage during crankshaft installation
247 engine type
Seal protector sleeve (on crankshaft)
AOOO 002 013 AOOO 002014
Seal protector sleeve 420 8769 80 (for 10 mm shaft)